Structure Optimization And Foundry Technology Design For A Crossing Type Crossbow

The crossbow is developed on the basis of the bow, showing a significant advantage compared to the bow. With the development of modern science and technology, the performance of modern crossbow has been improved through continuous optimization. It is widely used in the field of shooting, hunting and police equipment, and plays its superior performance.The crossing type structure crossbow is preliminary designed, combining with the property and structure features of the modern crossbow. Using the finite element software ABAQUS to analyze the static characteristics of the crossbow, the deformation and the stress distribution situation is showed. Through the comparison with traditional crossbow, it is proved that the crossing type crossbow is superior to the traditional one. The variable section bow is designed based on isostress beam theory, and the design formula of variable section size is given. Then the problems of the initial crossbow which are large weight and unreasonable stress distribution are solved. By respectively changing each variable of the crossing type structure, then the best radius and position of the circle is optimized through the comparative analysis. Because the inner side of the circular ring is the maximum stress location, its structure was optimized reasonable. The optimal structure of the crossing type crossbow is obtained. Modal analysis on the bow is to get the first steps The modal analysis gives the crossbow’s first six natural frequency and vibration mode. It provides a theoretical basis for their use and redesignAnalyzing the structure characteristics of the crossing type crossbow, its investment casting process is designed, and the filling and solidification process is simulated and analyzed with the help of ProCAST. Based on the prediction results of the shrinkage defect, the gating system and the riser are repeatedly improved, and finally get the optimal solution. In order to optimize the casting process parameters, with the pouring temperature, the temperature of shell and the pouring time being the study factors, we conduct orthogonal tests.When the pouring temperature was 1550℃, the temperature of shell was 900℃ and the pouring time was 3s, the liquid metal filling smoothly, the shrinkage porosity of the casting was the least.